Circulating tube



. Aug. J. F. ARTHUR CIRCULATING TUBE Filed Oct. 2, i926 INVENTOR.

TYTOIRNEY.

t d Aug. 16, 1927. a i i i 1,539,252 militia F FLC'E.

. JAMES F. Anrntrn, orynio'xsoiv my; PENNSYLVANIA,

This'inven'tion is a'method'of'securing tomore detail byreferen'ce tothe accompanygether a tube oi relatively thin'metal and ing. drawing;illustrating-by way of exama bushing or the like, 0'1"" relatively heavyp'l'e', the new article of manufacture and the metal. The invention alsoconsi'stsin the method ofmalringlit. It should bexunder- 5 new articleof manufacture, consisting of a stoo'd'that'the invention is not to belimiter thin tube anchored in a heavier bushing, to the exactdetailshere shown, but that itresulting from the practice of the method. maybecarried out in other ways, as de- According'to this invention the'tube'and fined within the scope of the: claims. In bushing are permanentlyanchored 'together, thedra wings, i 10 without'the necessity of threadinthe tube,- Fig. 1 is a sectional View showing the and without the" useof solder' or brazing first s'tep' of the-method of the invention; vor'l-ik'e operations involving the use of heat; Fig.- 2 f is" a"sectional view showing the" The elimination 'ofthenecessityo'fthreadsecond step; ing the tube permits the use ofrelatively Fig; 3 isa sectional view showing the 15 thin metal, thebushing of heavier metalfinish'ed joint; and, Y 1' j carrying the'necessary threads. r 1-"is"avie'w 01"? a modification;

The invention described in this apnlica- Referring" now to" thesedrawings in tion is an improvement over that shown'in' which" similarreference characters indicate my copending application, Ser. No.- 2033,similar parts, 1'is'a' thin walled tube, which 20 filed January 12,1925' I I may be'ofcopper', brass, fiber or other mate- The article ofmanufacture coveredby' rial and-may be about of an inch thick. thisinvention, consistingessentially 0!: a It will be understood that theinventionis tiiin'metal tube permanently secured in a not to'be limitedto'e'xact dimensions. threaded bushing, finds arr extensive use in Thebushin '2 to whicl' 'th' t b 1-1 t feed pipes for kitchen range boilers.The be secured comprises the portion'3 of subinvention howeveryis not tobe limited to sta ntial' thicl'r'ness', having an interior anthis use,but is intended to extend to any nula-r recess 4 and an exteriorinwardly situation where an article of this nature may sloped po-rti0n5. I The'exterior of part 8 is be applied. provided with a plurality offlat sides 3 so 30 According to this invention, a bushing of that it canbe turned with a wrench. TGlZZtlVGly heavy metal is PlOVlClGCl With anThe bushing 2 also comprises the substaninterior annular recess. The endof the thin tially cylindrical party 6 having exterior walled tube isinserted in the bushing, and screw threads'7; the bushing is interiorlyby the use of suitable tOols, as W11 b Cl6 cut out at 8 to'form ashoulder 9 against :15 scribed, the metal of the tube is expanded whichthe end of the tube 1 isadapted to into tight engagement with thisannular re t, Th b hi i al r vid d with a cess, thus permanently lockingthe tube and yli dri al rti n 10, bushing together. The end OT tilt,thin The tube and bushing'are agggmbled by walled tube is well insidethe bushing, and l i g the t b i th b hi with itg d is the bushing isprovided with a suitable resting against the shoulder 9, as shown instop, such as an interior annular shoulder, Fi 1, Th t b nd bu hing arethen against which the end of the tube is placed li d v r a r tati adrel 12 arried before it is expanded into the annular reby the'headpiece 13 having a wall 14 which cess of the bushing, as described above.f i h a t i t hi h th i ht- A modification of the inv n i n C n i t handend of the bushing rests. The mandrel in a thin walled tube anchored ina threaded 12 is provided with an annular bulge 12 bushing, as abovedescribed, the other end the exterior of which is substantially the ofthe thin tube being closed, while the same shape as the interior of theannular sides of the tube are provided with perforarecess 4 of thebushing. 50 tions for the lateral exit of water. This An idler wheel 15carried by a shaft 16 modification is of particular use with range ismounted near the mandrel 12 to have boilers, serving to direct theentering water movement toward and away from the manlaterally instead ofdownwardly, so that it drel. This wheel 15 has flanges 17 and 18 willnot stir up the sediment that collects which are'adapted to bear againstportions in the bottom of the boiler. 5 and 10 respectively of thebushing. The The invention will now be explained in flange 17 bearsagainst the extreme outer oInonLA'rInG TUBE? Application filed ember-2,1926. Seiia1N6'. 139,209?

or left-hand edge of portion 5. The wheel 15 is moved toward the mandrel12 with such force, that the bulge 12 on the mandrel forces the metal ofthe tube 1 outwardlv into tight engagement with the Wall of the recess 1of the bushing, thus locking the tube and bushing together. Theoperation just described forms an outwardly eX- panded annular shoulderon the tube shown at 19 in Fig. 3. The pressure of the two flanges 17and 18 against the bushing and tube forces the metal of the tube intoclose and intimate contact with the bushing all the way from that end ofthe tube, seated against the shoulder 9, to the left-hand end of thepart 5 of the bushing.

The tube and bushing are thereby anchored together quickly, securely andrigidly, and the resulting article of manufacture may be secured inoperative position by means of the screw threads 7 on the bushing.

Referring now to Fig. 4 there is shown a circulating tube for a hotwater heating boiler, comprising a thin walled tube 1, the end 20 ofwhich is closed and which is provided with a plurality of openings 21for the lateral escape of water, whereby the water delivered by the tubeis directed laterally instead of downwardly, so that it will not stir upthe sediment in the bottom of the tank or boiler. This tube 1 is securedin the bushing 2 as shown in Fig. 3.

I claim as my invention 1. A circulating tube for hot water heatingboilers, comprising a tube of relatively thin metal, one end of the tubebeing closed teriorly threaded bushing having an interior annular recessand an interior annular shoulder, and a thin walled tube, the end ofwhich is inside the bushing against said shoulder and which is providedwith an annular outwardly expanded portion in contact with the wall ofsaid annular recess.

3. A circulating tube comprising a thin walled tube and an eXteriorlythreaded bushing of heavier metal having an interior annular recess, thethin walled tube being expanded outwardly into contact with the wall ofsaid recess for securing the bushing in place on the tube, the bushinghaving a head to which a wrench may be applied.

4. A circulating tube comprising an exteriorly threaded bushing havingan interior annular recess and an interior annular shoulder, and a thinwalled tube, the end of which is inside the bushing against saidshoulder and which is provided with an annular outwardly expandedportion in contact with the wall 01: said annular recess, the bushinghaving ahead to which a wrench may be applied.

In testimony whereof I afliX my signature.

JAMES F. ARTHUR.

